package com.juhui.gateway.filter;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import com.juhui.common.core.utils.JsonUtils;
import com.juhui.gateway.config.properties.ApiDecryptProperties;
import com.juhui.gateway.config.properties.CustomGatewayProperties;
import com.juhui.gateway.utils.WebFluxUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 全局日志过滤器
 * <p>
 * 用于打印请求执行参数与响应时间等等
 *
 * @author melorogee
 */
@Slf4j
@Component
public class GlobalLogFilter implements GlobalFilter, Ordered {

	@Autowired
	private CustomGatewayProperties customGatewayProperties;
	@Autowired
	private ApiDecryptProperties apiDecryptProperties;

	private static final String START_TIME = "startTime";

	@Override
	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
		if (!customGatewayProperties.getRequestLog()) {
			return chain.filter(exchange);
		}
		ServerHttpRequest request = exchange.getRequest();
		String path = WebFluxUtils.getOriginalRequestUrl(exchange);
		String url = request.getMethod().name() + " " + path;

		// 打印请求参数
		if (WebFluxUtils.isJsonRequest(exchange)) {
			if (apiDecryptProperties.getEnabled()
					&& ObjectUtil.isNotNull(request.getHeaders().getFirst(apiDecryptProperties.getHeaderFlag()))) {
				log.info("[PLUS]开始请求 => URL[{}],参数类型[encrypt]", url);
			} else {
				String jsonParam = WebFluxUtils.resolveBodyFromCacheRequest(exchange);
				log.info("[PLUS]开始请求 => URL[{}],参数类型[json],参数:[{}]", url, jsonParam);
			}
		} else {
			MultiValueMap<String, String> parameterMap = request.getQueryParams();
			if (MapUtil.isNotEmpty(parameterMap)) {
				String parameters = JsonUtils.toJsonString(parameterMap);
				log.info("[PLUS]开始请求 => URL[{}],参数类型[param],参数:[{}]", url, parameters);
			} else {
				log.info("[PLUS]开始请求 => URL[{}],无参数", url);
			}
		}

		exchange.getAttributes().put(START_TIME, System.currentTimeMillis());
		return chain.filter(exchange).then(Mono.fromRunnable(() -> {
			Long startTime = exchange.getAttribute(START_TIME);
			if (startTime != null) {
				long executeTime = (System.currentTimeMillis() - startTime);
				log.info("[PLUS]结束请求 => URL[{}],耗时:[{}]毫秒", url, executeTime);
			}
		}));
	}

	@Override
	public int getOrder() {
		return Ordered.LOWEST_PRECEDENCE;
	}

}
